This paper presents a novel method for distance measurement by multi ultrasonic arrays within the Direct Sequence Spread Spectrum (DS-SS) framework of the communication system. In view of the results of ultrasonic distance measurement simulation, it can be seen that the system design considerations, which is ground on the demodulation of BPSK signals by digital correlation and the adaptive equalization of receiving channels by means of Least-Mean-Squares algorithm, lead to strong restraint of the effect of disturbance in many cases, such as the phase error of local carrier used for coherent demodulation, the jam of multipath channels, and the random drift of the gain and phase in receiving channels, hence improve greatly the signal-noise ratio and the resolving power in ultrasonic orientation system accordingly. Furthermore, since the principle of the ultrasonic measurement system adopted here is based on spread spectrum with pseudorandom sequence codes, it is easier to realize of the Code Division Multiple Access (CDMA) by allocating different codes at different testing areas, so as to distinguish different signals transmitted by different ultrasonic transmitters/receivers, which will extend the measuring scope of the system. Thus it can be said that the methods considered in this paper has expansive prospect in the measure and control field for practical purposes.